One more thing:
The detection snippet, uses $target - which when you are cross-compiling or
regular compiler is the target machine type that you specify or the
compiler is built for.
Aron Rosenberg
SightSpeed
At 09:53 PM 4/1/2004, you wrote:
>Actually, I prefer having the user explicitly specify --enable-sse
>because you might want to compile for other machines than what you have.
>Also, any idea what happens if the user already has CFLAGS=-O2 defined
>(and you add -O3)? Last thing, how do you check whether gcc accepts
>-msse?
>> Jean-Marc
>>Le ven 02/04/2004 à 00:40, Aron Rosenberg a écrit :
> > Here is code to add to configure.in to do what you want. It preserves
> > CFLAGS and uses that var to hold the sse enable flags. You can subset this
> > under the exisiting AC_ARG for sse or just make it do it all the time. If
> > you notice the i?86, that means any x86 platform target will have it
> > enabled. You can change that i686, but keep in mind that some distros
> > compile/target for i386 on the glibc / gcc compiles and you will sometimes
> > get i386 as the target even though you are on a pentium 3/4 box.
> >
> > Aron Rosenberg
> > SightSpeed
> >
> > +++++ Add to configure.in ++++++++
> >
> > echo -n "Checking for Platform ASM Speedups..."
> > case "$target" in
> > i?86*)
> > CFLAGS="$CFLAGS -D_USE_SSE -O3 -msse"
> > echo "Found and Activating SSE"
> > ;;
> > powerpc-apple-darwin*)
> > CFLAGS="-faltivec"
> > echo "Found and Activating Altivec"
> > ;;
> > *)
> > echo "None Found"
> > ;;
> > esac
>>--
>Jean-Marc Valin
>http://www.xiph.org/~jm/>LABORIUS
>Université de Sherbrooke, Québec, Canada
--- >8 ----
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